diff --git a/attn/pel/primary_src.hpp b/attn/pel/primary_src.hpp
index 659cb48..be40448 100644
--- a/attn/pel/primary_src.hpp
+++ b/attn/pel/primary_src.hpp
@@ -4,6 +4,8 @@
 #include "pel_section.hpp"
 #include "stream.hpp"
 
+#include <array>
+
 namespace attn
 {
 namespace pel